Time evolution of the number of stars in a specified region (left-hand plots) and their velocity dispersion (right-hand plots), as seen in xy projection. For each model (columns), the values in four regions are shown: around the IMBH (top row), on the opposite side of the SMBH from the IMBH (labelled 180°), and in two regions perpendicular to the SMBH–IMBH vector (labelled ±90°). The dashed lines show the known population and velocity dispersion of IRS13, respectively.